Griffin, G. (1967). An operational necessity. Collins.
芝加哥风格引文Griffin, Gwyn. An Operational Necessity. London: Collins, 1967.
MLA引文Griffin, Gwyn. An Operational Necessity. Collins, 1967.
警告：这些引文格式不一定是100％准确.
APA引文
Griffin, G. (1967). An operational necessity. Collins.
芝加哥风格引文Griffin, Gwyn. An Operational Necessity. London: Collins, 1967.
MLA引文Griffin, Gwyn. An Operational Necessity. Collins, 1967.